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Turbo code velocity matching and code bit reading method

A code rate and code rate technology, applied in the field of digital communication systems, can solve the problems of increasing signaling overhead and achieve the effect of saving signaling overhead

Inactive Publication Date: 2008-04-09
ZTE CORP
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Problems solved by technology

[0010] The introduction of the redundant version helps to simplify the synchronous HARQ operation, but the introduction of the redundant version may cause overlapping of the codewords corresponding to different HARQ subpackages (Overlapping), and when the asynchronous HARQ operation is performed, the selection of the redundant version is also important. Need to be controlled by signaling, thus increasing the signaling overhead of the system

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  • Turbo code velocity matching and code bit reading method

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Embodiment Construction

[0035] In order to facilitate a deep understanding of the technical content of the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0036] Aiming at the characteristic of rate matching of the circular buffer, the present invention proposes that the code word bits selected for each HARQ retransmission sub-packet are immediately following the code word bits of the preceding HARQ sub-packet. Specifically, since the circular buffer can be regarded as a "virtual circular buffer" of "R rows×C columns", as shown in FIG. 5 . (For example, the circular buffer in the 3GPP rate matching algorithm can be regarded as a 96-column virtual buffer). If the previous HARQ subpacket is transmitted to column i, even if this column has not been transmitted, then the current HARQ subpacket starts to read the codeword bits from column i+1, and if it reaches the end of the buffer, wrap around Continue ...

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Abstract

The invention provides a turbo code rate matching method, which comprise the following steps: (a) sending the information in groups to a turbo code encoder with a code rate of 1 / r to generate a system bit stream and (r-1) checked bit streams; (b) interleaving the system bit stream and the checked bit streams coded by the turbo code encoder via the individual sub-interleavers thereof, laying the system bit stream in the inside front part of a circular buffer and laying the checked bit streams behind the system bit stream in a staggered manner, to form a circular buffer zone; (c) sequentially reading E code bits required in each HARQ transmission from the circular buffer zone to form a HARQ sub-pack. The inventive method can completely realize the orthogonal retransmission of Turbo codes without defining redundant version number, thereby saving the signaling costs.

Description

technical field [0001] The invention relates to a digital communication system, in particular to a method for turbo code rate matching and code word bit reading during channel coding of the digital communication system. Background technique [0002] A digital communication system usually includes a source, a source coder, a channel coder, and a modulator at the transmitting end, and a demodulator, a channel decoder, a source decoder, and a sink at the receiving end, as shown in Figure 1. Show. The channel encoder is used to introduce redundant information to the information bits according to certain rules so that the channel decoder at the receiving end can correct the bit errors that occur when the information is transmitted on the channel to a certain extent. [0003] Among many channel coding techniques, Turbo code is currently recognized as one of the best forward error correction codes. The error correction performance of Turbo code is far superior to that of other co...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/18H04L1/22
CPCH04L1/1819H04L1/0067H04L1/0066
Inventor 袁志锋徐俊
Owner ZTE CORP
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